As much as I have lusted after one of those since they were announced, I'm looking for something a little more in a < $200 (US) price range. Maybe something 3D printed might be viable at a lower price point. Not really sure what the possibilities are for getting one in that price range.
You could look at the Holga 6x17 with the lens on it, then remove the lens but keep the shutter. Still have the vignetting issue to get around with the flat film plane.